Frigidaire
Abnormal Operating Noise – High-Voltage or Mechanical
Microwave makes loud buzzing, humming, or grinding noises during operation.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failing magnetron, Loose or failing cooling fan, Turntable motor noise, High-voltage transformer vibration
How to Fix / Troubleshooting
Safety First: Unplug the microwave before inspection. High-voltage components are dangerous.
Basic checks:
- Isolate source: Run the microwave with a cup of water and listen carefully. Does the noise seem to come from the bottom (turntable), back (transformer), or top (fan)?
- Turntable test: Remove the glass tray and roller ring, then run briefly. If the noise stops, the issue is with the tray, ring, or coupler.
Advanced checks:
- Fan inspection: Remove the outer cabinet and inspect the Frigidaire cooling fan for debris or bent blades.
- High-voltage noise: A loud, deep buzzing often indicates a failing magnetron or transformer, which should be replaced by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Cooling Fan Motor
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